Machinery for swinging cranes



NMdl. 2sn t-Shfil. o o e r STOC ee s ee MAGHINERY FOR SWINGING CRANESi No. 283,037. Patented Aug. 14, 1883.

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Patented Aug. 14, 1883;

H; T STOCK.

MACHINERY FOR SWINGING ORANES.

(No Model.)

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PATENT OFFICE."

. HOSEA T. STOCK, OFTOLEDO, onio.

MACHINERY FOR SWINGING CRANES.

SPECIFICATION forming part of Letters Patent No. 283,037, dated Application filed January 10, 1883. (No model.)

To M6 whom, itmay concern:

Be it known that I, HOSEA T. STOCK, a citizen of the United States, residing at Toledo,

Lucas county, Ohio, have invented certain new and useful Improvements in Machinery for Swinging'Cranes, of which the following is a specification. r

My invention relates to a device for swinging cranes of excavators, dredges,'and like machines, and other cranes, by means of recipery in relation to thebody of the machine in the manner shown; third, to provide a device which may be readily applied to excavators and dredges already in use without necessitat ing changes in the crane or the internal arrangement of the machine; and, fourth, to provide such machine with a double steam or compressed-air cylinder having pistons moving in opposite directions and controlled by asingle valve. I attain these objects by means of the mechanism hereinafter described, and illustrated in the accompanying drawings, constituting part hereof, in which- Figure 1 is a plan of my device as applied to a railroad-excavator. of the same. Fig. 3 is a horizontal longitudinal section of the double-cylinder pistons and valve employed in my device, and Fig. dis a side View of said cylinders, showing manner of connection Withsteain or air pipe and exhaust-pipe, together with rod by which the valve above referred to is actuated. I

Similar letters refer to similar parts throughout the several views. y i i A is a swinging crane. Bis a swinging circle or horizontal segmental pulley attached to the upper part of the crane. Made fast to pulley B, and passing around its periphery in suitable grooves, are ropes or chains 0 0, one of. which being pulled as the other is paid out Fig. 2 is aside view August 14, 1883.

causes pulley B to rotate on its axis, carrying with it the crane, which is thus swung either to the right or left. Ropes C 0 pass around blocks and pulleys b and b, as shown in Figs. 1 and 2, after theusual manner of double blocks and tackle. To avoid entanglement and rubbing of tackle, blocks and pulleys b and b are supported and kept in line by a frame, the sides of which form slides for blocks and pulleys b b, as shown.

D D are cylinders, or constitute a double cylinder,provid ed with piston-heads d and piston-rods e. The forward ends of piston-rod e are attached to pulleys b, and the other ends of said piston-rods are connected by rope or chain f, passing around pulley or guide 9. By the arrangement of the valve and ports here,- inafter described, the two cylinders D D'always take steam simultaneouslyat opposite ends, causing the two pistons to travel in opposite directions, one piston pulling one of the ropes 0, while the other rope C is eased off by the opposite piston, the tackle, however, being It will be observed,-however, that,though the pistons move in opposite directions, the pull on tackle G is byboth cylinders and pistons, by reason of the connecting-ropef. The same result obtained by the double cylinders and blocks and tackle may obviously be obtained by dispensing with one of the cylinders and pistons, and by attaching one end of rope f to the remaining piston, and the other end of rope f directly to block b,tl1ough I prefer the method above described. The short stroke of the two pistons is converted into the long sweep of the circle B by means of the intervening blocks, pulleys, and tackle shown. By these means the heavy, long, and cumbersome single oscillating cylinder in use for swinging cranes is dispensed with, and by placleading from a common central valve, h, each cylinder having two ports, one leading into each end of the cylinder. These ports serve alternately as induction and eduction passages. The admission of steam or compressed air into and its escape from cylinders D D are controlled by an oscillating four-chambered valve, two of said chambers, as, being eduction-passages, the remaining two, 3/ y, serving for induction. The several chambers of valve h are so arranged with. reference to steam-ports z and exhaust-ports 7c that when steam or air is admitted at one end of one cylinderthe same is simultaneously admitted at the other end of the other cylinder through the induction-chambers of valve 71, while at the same instant steamor air is permitted to escape through the eduction chambers 00, thence through exhaust-ports k k, and thence into escape-pipe L, as thepiston-heads advance in opposite directions. Upon giving valve h a quarter-turn, (which is done by the operator by means of a lever within convenient reach attached to roday) the operation is reversed and the crane is caused to swing in the opposite direction. 7

What I claim as my invention, and desire to secure by Letters Patent, is

1. I11 an excavator, dredge, or like machine,

' provided with a crane, in combination with such crane, swinging circle '13, ropes G O blocks and pulleys I) Z), cylinders D D, taking steam simultaneously at opposite ends, provided with pistons moving in opposite directions, rope f, and pulley g, substantially asshown and'described, for the purposes set forth.

2. In an excavator, dredge, or like machine, provided with a crane, in combination with such crane, swinging circle B, ropes O 0, blocks and pulleys Z) 1), cylinders D D, provided with pistons moving in opposite directions, rope f, pulley g, and valve and port mechanism h, i i z, 75 70, x m, and 51 3 substantially as shown and described, for the purposes set forth.

3.- In combination with crane A, swinging circle B, ropes O' O, and cylinders D D, the block and pulleys b b, arranged in a supporting-frame, said block and pulley I) being attached to piston-rods a e, and sliding in said supporting-frame, substantially as shown and described, for the purposes set forth.

4. The combination of pulley B, ropes O 0,

blocks and pulleys b b, cylinders D D, rope f,

and pulley 5 arranged in relation to the body of the supporting car or carriage, and crane A, substantially as shown and described,'for

the purposes set forth.

' HOSEA T. STOCK.

\Vitnesses:

HARRY E. KING, XV. F. CULnERsoN. 

